Because these targets weren't going to help win the war. Ergo, they weren't valid choices.
Even had they been strategic objectives, the targeting would have been invalid as they were not achievable during the war because of the systems involved. Not valid targets.
So the civilian victims, Jews and Gentiles, were targets who weren't going to help win the war and Ergo, they weren't valid choices.
You seem to agree that saving the Jews was simply not a priority for the Allies. Indeed you characterize it in even stronger terms, that it was not a valid choice. I don't think that will hold up in court. Then shall they also answer him, saying, Lord, when saw we thee an hungred, or athirst, or a stranger, or naked, or sick, or in prison, and did not minister unto thee? Then shall he answer them, saying, Verily I say unto you, Inasmuch as ye did it not to one of the least of these, ye did it not to me.
Matthew, Catholic chapter twenty five, Protestant verses forty four to forty five,
as authorized, but not authored, by King James